Similar story setting where the male lead gets sucked into a time loop and repeatedly tries to save the girl

The beginning setup of the drama is similar in which the best friend stands in to meet the male lead

Haven't watched this yet but based on the synopsis I recommend The Fierce Wife since both talk about the same themes with infidelity and marriage. Both are also a female-centered storyline

similar storyline, great ost, male lead gets into an accident and loses his memory meets the hardworking female lead

similar storyline where the FL is a romance novel editor and somehow ends up in a novel that she’s editing and attracts the attention of the male lead

tsundere male lead who doesnt know how to express his emotions
a bold confession from the female lead in the beginning of the drama

It has a story line where the male lead drives into the past and changes the timeline. There's an atonement component to this as well.